insulator

IPA: ˈɪnsʌɫeɪtɝ

A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
A person who installs insulation.

Examples of "insulator" in Sentences

The thick wool sweater acted as a perfect insulator against the bitter cold wind
In order to keep the hot coffee warm for longer, I used a double-walled insulator cup
The insulator on the power lines prevented any electrical currents from escaping and causing a dangerous situation
The insulating material in the walls of the house helped to regulate the temperature inside, keeping it comfortable year-round
Wearing gloves made of insulating material allowed me to work in the cold without my hands getting numb